Three black men have died in detention this year.
He was the first white person to die in detention since 1963.
Mabija died in detention on 7 July 1977, the day before his scheduled court hearing.
Fourteen people are said to have died in Palestinian detention.
The number of torture victims is not known, nor are there figures for people who have died in detention.
It was assumed that he was captured by Soviet troops and died in detention.
About 400 people died in pretrial detention last year, according to prison figures.
Fewer than 200 Uruguayans died in detention while the army ruled.
In two years, seven people have died in detention.
He died in detention the following year, and no one knows his final resting place.